{"title":"冲击回波相位谱在检测肌腱导管灌浆缺陷中的应用","authors":"Wenhao Chai, Yaxun Yang","doi":"10.1520/jte20230532","DOIUrl":null,"url":null,"abstract":"\n The impact-echo method is widely used to detect grouting defects within prestressed concrete tendon ducts. However, when the distance from the rebar to the test surface was half the depth from the defect to the test surface, the amplitude spectrum of the conventional fast Fourier transform failed to distinguish between internal defects in tendon ducts and external rebar. To overcome this challenge, in this paper, the phase spectrum and amplitude spectrum were combined to identify the internal defects and external rebar of the tendon ducts. First, the amplitude spectrum was used to determine the depth of defects and rebar, and then the phase spectrum was used to further determine the category of the reflected interface (defect interface or rebar interface). The feasibility of the method was verified by model tests and numerical simulations. Afterward, the effects of impact duration, sampling time, the size of defect, duct thickness, rebar, and defect burial depth on the phase of the impact echo were analyzed. The results show that the proposed method can identify the internal defects in the tendon ducts and rebars very well.","PeriodicalId":17109,"journal":{"name":"Journal of Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.8000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Application of the Phase Spectrum of Impact Echo in the Detection of Grouting Defects in the Tendon Ducts\",\"authors\":\"Wenhao Chai, Yaxun Yang\",\"doi\":\"10.1520/jte20230532\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n The impact-echo method is widely used to detect grouting defects within prestressed concrete tendon ducts. However, when the distance from the rebar to the test surface was half the depth from the defect to the test surface, the amplitude spectrum of the conventional fast Fourier transform failed to distinguish between internal defects in tendon ducts and external rebar. To overcome this challenge, in this paper, the phase spectrum and amplitude spectrum were combined to identify the internal defects and external rebar of the tendon ducts. First, the amplitude spectrum was used to determine the depth of defects and rebar, and then the phase spectrum was used to further determine the category of the reflected interface (defect interface or rebar interface). The feasibility of the method was verified by model tests and numerical simulations. Afterward, the effects of impact duration, sampling time, the size of defect, duct thickness, rebar, and defect burial depth on the phase of the impact echo were analyzed. The results show that the proposed method can identify the internal defects in the tendon ducts and rebars very well.\",\"PeriodicalId\":17109,\"journal\":{\"name\":\"Journal of Testing and Evaluation\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.8000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Testing and Evaluation\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1520/jte20230532\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, CHARACTERIZATION & TESTING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Testing and Evaluation","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1520/jte20230532","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
Application of the Phase Spectrum of Impact Echo in the Detection of Grouting Defects in the Tendon Ducts
The impact-echo method is widely used to detect grouting defects within prestressed concrete tendon ducts. However, when the distance from the rebar to the test surface was half the depth from the defect to the test surface, the amplitude spectrum of the conventional fast Fourier transform failed to distinguish between internal defects in tendon ducts and external rebar. To overcome this challenge, in this paper, the phase spectrum and amplitude spectrum were combined to identify the internal defects and external rebar of the tendon ducts. First, the amplitude spectrum was used to determine the depth of defects and rebar, and then the phase spectrum was used to further determine the category of the reflected interface (defect interface or rebar interface). The feasibility of the method was verified by model tests and numerical simulations. Afterward, the effects of impact duration, sampling time, the size of defect, duct thickness, rebar, and defect burial depth on the phase of the impact echo were analyzed. The results show that the proposed method can identify the internal defects in the tendon ducts and rebars very well.
期刊介绍:
This journal is published in six issues per year. Some issues, in whole or in part, may be Special Issues focused on a topic of interest to our readers.
This flagship ASTM journal is a multi-disciplinary forum for the applied sciences and engineering. Published bimonthly, the Journal of Testing and Evaluation presents new technical information, derived from field and laboratory testing, on the performance, quantitative characterization, and evaluation of materials. Papers present new methods and data along with critical evaluations; report users'' experience with test methods and results of interlaboratory testing and analysis; and stimulate new ideas in the fields of testing and evaluation.
Major topic areas are fatigue and fracture, mechanical testing, and fire testing. Also publishes review articles, technical notes, research briefs and commentary.